①说话时______在振动;②风吹树叶哗哗响,树叶在______.
①我们说话的声音是声带振动发出的;
②风吹树叶哗哗响,是树叶振动发出的声音.
故答案为:声带;振动.
This agreement will be signed by the managers_________. [ ]
A. concerns
B. concerning
C. concerned
D. to be concerned
“实践性课程”的开发方法是()
A.决策
B.审议
C.建构
D.协商